diff --git a/pom.xml b/pom.xml
index 0c0885a..5e0b5c1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -146,7 +146,7 @@
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-core</artifactId>
-            <version>4.3.14.RELEASE</version>
+            <version>4.3.21.RELEASE</version>
         </dependency>
         <dependency>
             <groupId>com.squareup.okhttp3</groupId>